There has been plenty of criticism from fans and pundits about the team's unorthodox 3-4-3 formation, but Postecoglou explained he wasn't just focusing on making the World Cup, but also on being a strong performer at the tournament.

"It's not just about qualifying for us. We want to continue to evolve and become a really strong team to compete at a World Cup and do well," he said.

"If you can beat Japan away from home, it's a good indicator that you're a strong team.

"It's not just about getting a result - it’s about playing well against a quality opponent and showing that we have progressed as a team."

The Socceroos can still qualify automatically with a draw against Japan, provided they get three points against Thailand in Melbourne on Tuesday.